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Static: Add syntax for static MPLS labels

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Instead of just using route attributes, static routes with
static MPLS labels can be defined just by e.g.:

  route 10.1.1.0/24 mpls 100 via 10.1.2.1 mpls 200;
This commit is contained in:
Ondrej Zajicek 2023-09-22 19:49:15 +02:00
parent 3572605151
commit 81a20ca5d8
4 changed files with 46 additions and 10 deletions
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4
nest/mpls.c
View File

@ -825,7 +825,9 @@ mpls_free_fec(struct mpls_fec_map *m, struct mpls_fec *fec)
DBG("Free FEC %u\n", fec->label);
mpls_free_label(m->domain, m->handle, fec->label);
if (fec->policy != MPLS_POLICY_STATIC)
mpls_free_label(m->domain, m->handle, fec->label);
HASH_REMOVE2(m->label_hash, LABEL, m->pool, fec);
switch (fec->policy)

8
proto/static/config.Y
View File

@ -107,15 +107,21 @@ stat_nexthops:
| stat_nexthops stat_nexthop
;
stat_mpls:
/* empty */
| MPLS expr { this_srt->mpls_label = $2; if ($2 >= MPLS_MAX_LABEL) cf_error("MPLS label must be less than 2^20"); }
;
stat_route0: ROUTE net_any {
this_srt = cfg_allocz(sizeof(struct static_route));
add_tail(&STATIC_CFG->routes, &this_srt->n);
this_srt->net = $2;
this_srt->mpls_label = (uint) -1;
this_srt_cmds = NULL;
this_srt_last_cmd = NULL;
this_srt->mp_next = NULL;
this_snh = NULL;
}
} stat_mpls
;
stat_route:

43
proto/static/static.c
View File

@ -103,16 +103,37 @@ static_announce_rte(struct static_proto *p, struct static_route *r)
{
struct mpls_channel *mc = (void *) p->p.mpls_channel;
ea_list *ea = alloca(sizeof(ea_list) + sizeof(eattr));
*ea = (ea_list) { .flags = EALF_SORTED, .count = 1 };
ea_list *ea = alloca(sizeof(ea_list) + 2 * sizeof(eattr));
*ea = (ea_list) { .flags = EALF_SORTED };
ea->next = a->eattrs;
a->eattrs = ea;
ea->attrs[0] = (eattr) {
.id = EA_MPLS_POLICY,
.type = EAF_TYPE_INT,
.u.data = mc->label_policy,
};
if (r->mpls_label != (uint) -1)
{
ea->attrs[0] = (eattr) {
.id = EA_MPLS_LABEL,
.type = EAF_TYPE_INT,
.u.data = r->mpls_label,
};
ea->attrs[1] = (eattr) {
.id = EA_MPLS_POLICY,
.type = EAF_TYPE_INT,
.u.data = MPLS_POLICY_STATIC,
};
ea->count = 2;
}
else
{
ea->attrs[0] = (eattr) {
.id = EA_MPLS_POLICY,
.type = EAF_TYPE_INT,
.u.data = mc->label_policy,
};
ea->count = 1;
}
}
/* Already announced */
@ -373,7 +394,7 @@ static inline int
static_same_rte(struct static_route *or, struct static_route *nr)
{
/* Note that i_same() requires arguments in (new, old) order */
return static_same_dest(or, nr) && f_same(nr->cmds, or->cmds);
return (or->mpls_label == nr->mpls_label) && static_same_dest(or, nr) && f_same(nr->cmds, or->cmds);
}
static void
@ -455,6 +476,7 @@ static_postconfig(struct proto_config *CF)
cf_error("Channel not specified");
struct channel_config *cc = proto_cf_main_channel(CF);
struct channel_config *mc = proto_cf_mpls_channel(CF);
if (!cf->igp_table_ip4)
cf->igp_table_ip4 = (cc->table->addr_type == NET_IP4) ?
@ -465,9 +487,14 @@ static_postconfig(struct proto_config *CF)
cc->table : cf->c.global->def_tables[NET_IP6];
WALK_LIST(r, cf->routes)
{
if (r->net && (r->net->type != CF->net_type))
cf_error("Route %N incompatible with channel type", r->net);
if ((r->mpls_label != (uint) -1) && !mc)
cf_error("Route %N has MPLS label, but MPLS channel not specified", r->net);
}
static_index_routes(cf);
}

1
proto/static/static.h
View File

@ -48,6 +48,7 @@ struct static_route {
byte onlink; /* Gateway is onlink regardless of IP ranges */
byte weight; /* Multipath next hop weight */
byte use_bfd; /* Configured to use BFD */
uint mpls_label; /* Local MPLS label, -1 if unused */
struct bfd_request *bfd_req; /* BFD request, if BFD is used */
mpls_label_stack *mls; /* MPLS label stack; may be NULL */
};